Which one of the following wavelength radiations may correspond to...

The wavelength range of X-rays in the electromagnetic spectrum is generally from $0.01 \text{ nm}$ to $10 \text{ nm}$ (or $0.1 \text{ \AA}$ to $100 \text{ \AA}$).

Among the given options, $1 \text{ nm}$ falls well within the characteristic wavelength range of X-rays.

Wavelengths from $10 \text{ nm}$ to $400 \text{ nm}$ correspond to the ultraviolet region.

Answer: 1 nm